Re: Cumulative samples without callgraph?

Hi,

Really no one able to comment on this?

Best,
-Nikolaus

On 04/16/2015 10:00 AM, Nikolaus Rath wrote:
> Hello,
> 
> I have gathered some profile data using just "operf <program>" (i.e., no
> -g option to gather callgraph data).
> 
> However, when looking at the gmon output with
> 
> $ opgprof <program>
> $ gprof -p <program> | head
> 
> I find that there are distinct counts for cumulative and self:
> 
>> Flat profile:
>>
>> Each sample counts as 1 samples.
>>   %   cumulative   self              self     total           
>>  time   samples   samples    calls  T1/call  T1/call  name    
>>   5.19 14089090.00 14089090.00                             dagmg_mumps_302_
>>   4.85 27256080.00 13166990.00                             mcdriver_mp_mc_push_
>>   4.83 40373868.00 13117788.00                             dagmg_mumps_249_
>>   4.56 52738720.00 12364852.00      
> 
> 
> I'm confused by this. Doesn't "cumulative" mean the time spend in a
> function including time spend in calls to other functions? But if operf
> didn't look at the callgraph, how can it know anything about this? I
> thought that for every sample operf just records what function is being
> executed, but not how this function was called.
> 
> Best,
> -Nikolaus
> 


-- 
Nikolaus Rath, Ph.D.
Senior Scientist
Tri Alpha Energy, Inc.
+1 949 830 2117 ext 211

------------------------------------------------------------------------------
One dashboard for servers and applications across Physical-Virtual-Cloud 
Widest out-of-the-box monitoring support with 50+ applications
Performance metrics, stats and reports that give you Actionable Insights
Deep dive visibility with transaction tracing using APM Insight.
http://ad.doubleclick.net/ddm/clk/290420510;117567292;y